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In 1909, Charles A. Clark described a radiographic procedure for localizing impacted teeth to determining their relative antero-posterior position. If the two teeth (or, by extension, any two objects, such as a tooth and a foreign object) are located in front of one another relative to the x-ray
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beam, they will appear superimposed on one another on a dental radiograph, but it will be impossible to know which one is in front of the other. To determine which is in front and which is behind, Clark proposed his
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149:), the objects appear on the film in almost the same relationship that they share in reality. But by shifting the x-ray collimator (radiation source) to one side and tilting it towards the objects (
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In 1952, Richards amended this rule using only 2 radiographs, asserting that the object positioned more buccally will move more relative to the object positioned more palatally or lingually.
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than initially suspected. With the use of this second film, it was determined that the metal fragment was indeed embedded in the cheek.
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Diagrammatic representation of the buccal object rule being employed. In the first radiograph (
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Expose another film while angle of the x-ray beam has been changed. If an object moves in the
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A method of ascertaining the relative position of unerupted teeth by means of film radiographs
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As a generalization, but not specifically stated as part of
Richards' buccal object rule, the
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angulation, however, the metal fragment appeared to move a great deal to superimpose on the
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The video below shows a 5 minute illustration describing SLOB rule in dentistry
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is a method used to determine the relative position of two objects in the
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in the second radiograph when repositioning the x-ray source.
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an object is (i.e. the closer it is to the x-ray source) the
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of the premolar, indicating that the fragment was way more
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Roentgenographic localization of the mandibular canal
259:Journal of the Tennessee State Dental Association
85:to the other object. If the object moves in the
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181:University of Alabama School of Dentistry
132:https://www.youtube.com/embed/AzjvFPlZtZg
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52:using projectional dental radiography.
225:Royal Society of Medicine Transactions
124:SLOB rule in Dentistry Video Tutorial
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183:, this rule is referred to as the
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91:direction of the source, it is
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28:) exposed at a very severe
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20:The initial radiograph (
242:Journal of Oral Surgery
46:buccal object/SLOB rule
255:The buccal object rule
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99:to the other object.
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137:Buccal Object Rule
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174:more it will move
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261:1953;33:263-268
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244:1952;10:325-329
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159:lingual object
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253:Richards AG.
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155:buccal object
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34:facial aspect
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56:Clark's Rule
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170:more buccal
50:oral cavity
219:Clark CA.
207:References
278:Dentistry
185:BAMA rule
64:SLOB rule
272:Category
115:pposite
111:ingual;
88:opposite
179:At the
81:lingual
195:lways
191:uccal
95:buccal
38:buccal
30:distal
203:way.
199:oves
151:right
119:uccal
26:right
147:left
107:ame
74:same
44:The
22:left
274::
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240:.
223:.
187::
201:a
197:m
193:a
189:b
117:B
113:O
109:L
105:S
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